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Élasticité, Morphologie et Drainage Magnétique dans les Mousses liquide

Abstract : A liquid foam is made of bubble trapped in a liquid matrix. This structure gives to foam a complex hydrodynamic behaviour, which involves elasticity, plasticity and drainage through the skeleton of the foam. The first part of the manuscript deals with the elasticity of foams. By using a new definition of the statistical strain tensor, we have shown that it is possible to describe the elastic state of foams, even in a plastic regime. We also have studied the elastic response of a single Plateau border made by the junction of three films leaning on a rigid wire. By bubbling air in ferrofluid (a colloidal suspension of magnetic particles) and soap solution, we have been able to make stable ferrofluid foams. In these foams, it is possible to add a magnetic force to the classical capillary and gravitational forces. We have shown, using quasi two-dimensional foams that the section of the Plateau border depends on the orientation of the magnetic field. In three-dimensional foams it is possible to slow down or to enhance drainage. When confined in cylindrical tube, it is possible to manipulate the structure of the foam by using local strong gradient field.
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https://tel.archives-ouvertes.fr/tel-00007740
Contributor : Eric Janiaud <>
Submitted on : Monday, December 13, 2004 - 7:49:59 PM
Last modification on : Friday, March 12, 2021 - 3:32:21 AM
Long-term archiving on: : Friday, April 2, 2010 - 8:43:59 PM

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  • HAL Id : tel-00007740, version 1

Citation

Eric Janiaud. Élasticité, Morphologie et Drainage Magnétique dans les Mousses liquide. Dynamique des Fluides [physics.flu-dyn]. Université Paris-Diderot - Paris VII, 2004. Français. ⟨tel-00007740⟩

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